python - I get "undefined variable" from pydev with the code below. Can someone please tell me what's wrong -

this code i've written. i'm beginner @ python , part of first practice. so, problem i'm getting "undefined variable" error dieface1 , dieface2 in last line of code here.

def rolldie():     die1 = [1,2,3,4,5,6]      die2 = [1,2,3,4,5,6]     dieface1 = int(random.shuffle(die1))     dieface2 = int(random.shuffle(die2))     diefacetotal = dieface1+dieface2     while (userin > pot or userin < 0):         userin = (raw_input(" invalid bet, please enter right bet amount"))      print "you rolled ", dieface1, "and ", dieface2 

random.shuffle() not return anything. in code, should getting like:

typeerror: int() argument must string or number, not 'nonetype' 

simply, random.shuffle(die1) on own line. isn't needed in case: if want random value list, use random.choice():

dieface1 = random.choice(die1)